Malicious PDF — malware analysis report

Static analysis result for SHA-256 604ee8ebf16afafc…

MALICIOUS

PDF

43.8 KB Created: 2020-07-31 11:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c50fdc044b99008fd5335021c4babc SHA-1: b64aec456804a8a567b50589549fe042eae67305 SHA-256: 604ee8ebf16afafcea64440c143a91bc9c751142e096a5ed90f74be9dcc5e4c2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, including a known malicious redirector at 'ttraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of generated links, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to academic papers, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=ssc+electrical+engineering+question+papers+pdf
    • http://files.wotennis.com/uploads/1/3/2/3/132302759/liniwanetazi.pdf
    • http://files.amfcontractinginc.com/uploads/1/3/0/8/130874254/pejabojibirawa_vesawozaluze.pdf
    • http://files.fiddlerofstrathspey.co.uk/uploads/1/3/1/4/131437474/2557238.pdf
    • http://files.woodgatebeachkayakandpaddleboardhire.com/uploads/1/3/1/4/131452944/pamobofilive_fowefofuvike_repevivar_gobod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/wejifogodab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/xiwese.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/jimen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/ganuvavupebuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9111/6700/files/75270391992.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0157/files/74164575654.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/pedotupiwibeloxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3390/3783/files/buzadaberegesorojomadupul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63032467643.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d0e.bin
f1fcde63f0ea68532dd3052a699a6a57fa06cb4ada4343553d7ba73c48dedd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0E 5432 bytes
font_01_sfnt_off00007f77.bin
3a6d96cafa6d3699ebcaba46916d2fcec4ccf07bda9e21c94ca7923de5dcfa92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F77 10112 bytes

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